added syncdelays + cpu init

diff --git a/fx2/fx2.c b/fx2/fx2.c
index fcb3dd4c77f8a9596e29d1750a0412cad007a247..c52c81b082282a25b992ced01b2a9ef69ec2e57b 100644 (file)
--- a/fx2/fx2.c
+++ b/fx2/fx2.c
@@ -3,9 +3,9 @@
  *
  * author: hackbard@hackdaworld.org
  *
- * number of priorities:
- * - switch on board power
- * - allow high speed usb transfer
+ * feature list:
+ * - switch on board power (done)
+ * - allow high speed bulk usb transfer
  * - do jtag
  * 
  */
@@ -55,9 +55,9 @@ sfr at 0xb0 IOD;
        nop; nop; nop; nop; nop; nop; nop; nop; \
        nop; _endasm
 
-void power_on() {
+void power_init() {
 
-       /* high level must be applied to the mosfet gate for power on
+       /* pin 7 of port d connected to mosfet gate controlling the board power
         *
         * ref: http://digilentinc.com/Data/Products/NEXYS/Nexys_sch.pdf
         */
@@ -65,8 +65,30 @@ void power_on() {
        /* configure pin 7 of port d as output */
        OED|=(1<<7);
 
-       /* pull it high */
-       IOD|=(1<<7);
+}
+
+void toggle_power() {
+
+       /* toggle high/low state of the mosfet gate */
+
+       if((IOD&(1<<7)))
+               IOD&=~(1<<7);
+       else
+               IOD|=(1<<7);
+
+}
+
+void cpu_init() {
+
+       /* cpu initialization: (0x10)
+        * - 48 mhz
+        * - none inverted signal
+        * - no clk out
+        */
+
+       CPUCS=(1<<4);
+       SYNCDELAY;
+
 }
 
 void slave_fifo_init() {
@@ -76,21 +98,28 @@ void slave_fifo_init() {
 
        /* set bit 0 and 1 - fifo slave config */       
        IFCONFIG|=0x03;
+       SYNCDELAY;
 
        /* async mode */
        IFCONFIG|=0x04;
+       SYNCDELAY;
 
        /* p. 180: must be set to 1 */
        REVCTL|=((1<<0)|(1<<1));
+       SYNCDELAY;
 
        /* 8 bit fifo to all endpoints
         *
         * ('or' of all these bits define port d functionality)
         */
        EP2FIFOCFG&=~(1<<0);
+       SYNCDELAY;
        EP4FIFOCFG&=~(1<<0);
+       SYNCDELAY;
        EP6FIFOCFG&=~(1<<0);
+       SYNCDELAY;
        EP8FIFOCFG&=~(1<<0);
+       SYNCDELAY;
 
        /* default indexed flag configuration:
         *
@@ -111,28 +140,42 @@ void slave_fifo_init() {
         * 0x01 = 0 0 0 0 0 0 0 1 = invalid (bit,type,buf)
         */
        EP2CFG=0xa0;
+       SYNCDELAY;
        EP4CFG=0x01;
+       SYNCDELAY;
        EP6CFG=0xe0;
+       SYNCDELAY;
        EP8CFG=0x01;
+       SYNCDELAY;
 
        /* reset the fifo */
        FIFORESET=0x80; /* nak all transfers */
+       SYNCDELAY;
        FIFORESET=0x02; /* reset ep2 */
+       SYNCDELAY;
        FIFORESET=0x06; /* reset ep6 */
+       SYNCDELAY;
        FIFORESET=0x00; /* restore normal operation */
+       SYNCDELAY;
 
        /* auto in/out, no cpu interaction! auto in len = 512 */
        EP2FIFOCFG|=(1<<4);
+       SYNCDELAY;
        EP6FIFOCFG|=(1<<3);
+       SYNCDELAY;
        EP6AUTOINLENH=(1<<1);
+       SYNCDELAY;
        EP6AUTOINLENL=0;
+       SYNCDELAY;
 
-       /* maybe OUTPKTEND necessary (with skip=1) */
 }
 
 void ep1_init() {
 
-       /* initialize endpoint 1 (will be used for jtag) */
+       /* initialize endpoint 1
+        *
+        * used for jtag & control
+        */
 
        /* endpoint 1 configuration:
         *
@@ -143,13 +186,18 @@ void ep1_init() {
 
 void fx2_init() {
 
-       /* swicth on power */
-       power_on();
+       /* cpu init */
+       cpu_init();
+
+       /* power init & power on */
+       power_init();
+       toggle_power();
 
        /* slave fifo init */
        slave_fifo_init();
 
-       /* ep1_init(); */
+       /* ep1 init */
+       ep1_init();
 }
 
 void main() {